Boring apparatus



June 28, 1938. M. J. WURZINGER BORING APPARATUS Filed July 15, 1937PIE|- 1 A l I 2 4.

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IIAXIMILLAN [JUR NGER- ATTORNEYS June 28, 1938. M. J. WURZINGER BORINGAPPARATUS Filed July 13, 1937 2 Sheets-Sheet 2 gal INVENTOR. UK M 5 EE'ATTORNEYS.

lfAXIMI LIAN Patented June 28, 1938 oi'rso STATES PATENT OFFICE 2Claims.

This invention relates to improvements in boring apparatus and hasparticular reference to an under reamer.

The principal object of this invention is to produce a device fordrilling holes through any surface and to then under-cut or enlarge thebottom of the hole for any desired purpose, such as for sealing in orcementing the bottom of the well.

A further object is to produce a device of this character which issturdy in construction, yet one which will enter the ordinary drilledwell, and one which will operate in an efficient manner.

A further object is to produce a device of this character whereinadjustments may be readily made so as to vary the amount of theunder-cut.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

Fig. l is a side elevation of my tool, with the under-cutting fingers inretracted position;

Fig. 2 is an enlarged detailed View, showing portions thereof in crosssection;

Fig. 3 is a cross sectional view taken on the line 3--3 of Fig. 2; and

Fig. 4 is a cross sectional View taken on the line 4-4 of Fig. 2.

In drilling wells, particularly deep wells, it is often necessary tounder-cut the well at certain portions of its depth so as to placecement in the under-cut portion.

I have, therefore, devised a tool which will accomplish this work ofunder-cutting in a most eificient manner.

In the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of my invention, it will be noted that mytool consists of sections 5, 6, l, and 8, forming a body member, whichsections are connected by rings 9. To the upper section 5 is connected ahead II; and to the lower section 8 is connected a foot piece l2.Extending through the head H, sections 5, 6, l, and 8, and foot piece I2is a rod l3, which has a threaded upper end l4, upon which is positioneda buffer l6, which is held in position by lock nuts I! and 18. Thisbuffer at certain times is adapted to come to rest against the top ofthe head II. The relative movement is designated by the arrows at A inFig. 1. Secured to the upper end of the rod I3 is a supporting yoke l9,having an eye 2|, to which the cable 22 is attached. This yoke alsosupports pipes 23 and 24. The pipe 23 is connected to a bore 26, passingdownwardly through the rod 13. Within the sections 5, 6, I, and 8 andmounted upon the rod l3 are a spring 25 and a fitting 21, the spring 25bearing against the upper end of 5 the section 5 and also against a nut28 mounted upon the rod 13. The nut 28 and the fitting 21 are threadedlycarried on the rod l3 and through this threaded adjustment, may be movedup and down thereon. The fitting 2'! has a plurality of 10 fingers 29pivoted thereto. These fingers may be secured in any desired manner.Attached to the lower end of the foot piece is a boring head 3|, havingpassages 32 therethrough, which passages communicate with the bore 25,the purpose 16 of which will be later seen. A removable bit 33 iscarried by the head 3|. The pipe 24 extends downwardly into the head Hand has a bellshaped lower extremity, the purpose of which will be laterseen. 20

With a tool constructed in accordance with the above, it will beapparent that as the tool is lowered into the well, the weight of thesections 5, 6, l, and 8, and its attached parts, will naturally causethe same to slide downwardly on the 25 rod l3, against the tension ofthe spring 25, thus drawing the fingers 29 from the dotted line positionof Fig. 1 to the full line position of this figure. At the same time,the surface 34 of the extremity of the foot piece will be in contactwith 30 the surface 36 of the head 3|. We will now assume that the toolhas reached the bottom and the bit 33 is resting upon the supportingground, the parts will still remain in the same position as they didduring the lowering of the tool. By 35 now turning on fluid pressurethrough the pipe 23, this pressure will pass through the rod l3 and outof the passages 32. This fluid pressure will be sufiicient as it movesupwardly in the well to contact the bottom surface 31 of the foot 40piece l2; and this upward pressure together with the expansive pressureof the spring 25 will cause the fingers 29 to tend to move outwardlyinto contact with the sides of the hole being bored. The pipe 24 may betermed a suction 45 pipe for withdrawing excess fluid from the well.Now, by either reciprocating the entire tool with an up and down motion,or rotating the same, under-cutting action will take place, the amountof the under-cutting being regulated by the 50 coarse adjustment of thefitting 2'! on the rod l3, or by the finer adjustment of the lock nutsI! and I8.

It will thus be apparent that my device will accomplish all the objectsabove set forth. 55

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claims.

Having thus described my invention, I c1aim:-

1. In an under-cutting tool of the character described, a body portion,a hollow rod extending through said body portion, a head secured to saidrod at a point below said body portion, openings formed through saidhead and communicating with the interior of said hollow rod, a bitsecured to said head, an adjustable fitting carried by said rod andpositioned within said body portion, fingers pivotally secured to saidfitting, and spring means interposed between said fitting and the top ofthe interior of said body portion.

2. In an under-cutting .tool of the character described, a body portion,a hollow rod extending through said body portion, a head secured to saidrod at a point below said body portion, openings formed through saidhead and communicating with the interior of said hollow rod, a bitsecured to said head, an adjustable fitting carried by said. rod andpositioned within said body portion, fingers pivotally secured to saidfitting, spring means interposed between said fitting and the top of theinterior of said body portion, and means for creating a flow of liquidthrough said rod and said head.

MAIHMILIAN JOSEPH WURZINGER.

